JP2002241150A - Reduced slag solidified body and its manufacturing method - Google Patents
Reduced slag solidified body and its manufacturing methodInfo
- Publication number
- JP2002241150A JP2002241150A JP2001037905A JP2001037905A JP2002241150A JP 2002241150 A JP2002241150 A JP 2002241150A JP 2001037905 A JP2001037905 A JP 2001037905A JP 2001037905 A JP2001037905 A JP 2001037905A JP 2002241150 A JP2002241150 A JP 2002241150A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- sio
- reduced
- solidified
- reduced slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 35
- 239000010883 coal ash Substances 0.000 claims description 23
- 239000000126 substance Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 239000004575 stone Substances 0.000 claims description 16
- 239000002699 waste material Substances 0.000 claims description 13
- 239000002956 ash Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000011449 brick Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 abstract description 21
- 238000010298 pulverizing process Methods 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 239000000203 mixture Substances 0.000 description 11
- 238000000227 grinding Methods 0.000 description 10
- 238000009628 steelmaking Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】この発明は、電気炉での製鋼
工程で排出される還元スラグから形成した還元スラグ固
化体及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidified reduced slag formed from reduced slag discharged in a steelmaking process in an electric furnace and a method for producing the same.
【０００２】[0002]
【従来の技術】電気炉での製鋼工程で排出されるスラグ
には、酸化スラグと還元スラグがある。酸化スラグは、
製鋼の第一工程であるＥＦ炉から排出されるスラグであ
り、次表１に例示されるような化学組成を有している。2. Description of the Related Art Slag discharged in a steelmaking process in an electric furnace includes oxidized slag and reduced slag. Oxidized slag is
It is slag discharged from the EF furnace which is the first step of steel making, and has a chemical composition as exemplified in Table 1 below.
【０００３】[0003]
【表１】酸化スラグの化学組成例（％） 酸化スラグは、ＥＦ炉からスラグポットに排出された
後、スラグ処理場にて流出させ、その後は自然冷却によ
り固化させている。冷却した酸化スラグ固化体は、粉砕
し、３０ｍｍ以下の砕石状にする。この酸化スラグ砕石
は、化学的に安定で、水に溶解したり、崩壊したりする
ことがないので、路盤材やコンクリート骨材等として利
用されている。Table 1 Example of chemical composition of oxidized slag (%) The oxidized slag is discharged from the EF furnace to a slag pot, flows out in a slag treatment plant, and is then solidified by natural cooling. The cooled solidified oxide slag is pulverized into a crushed stone of 30 mm or less. This crushed oxidized slag is chemically stable and does not dissolve or disintegrate in water, and is therefore used as a roadbed material, a concrete aggregate or the like.
【０００４】一方、製鋼の第２工程のＬＦ炉から排出さ
れるスラグとして、いわゆる還元スラグがある。このＬ
Ｆ炉から排出される還元スラグは、酸化スラグと同様に
スラグポットに受け、処理場に搬送し、流出させ、自然
放冷により冷却される。しかしながら、この還元スラグ
は、冷却過程で粉状化し、酸化スラグのように固化体に
ならないので砕石状にできない。On the other hand, there is so-called reduced slag as slag discharged from the LF furnace in the second step of steelmaking. This L
Like the oxidized slag, the reduced slag discharged from the furnace F is received in a slag pot, transported to a treatment plant, discharged, and cooled by natural cooling. However, the reduced slag cannot be formed into a crushed stone because it is powdered in a cooling process and does not become a solid like oxide slag.
【０００５】[0005]
【発明が解決しようとする課題】上記粉状化した還元ス
ラグをコンクリートに混和した場合、そのコンクリート
固化体には、亀裂が生じたり、一部剥落する個所も発生
するため、土木資材として再利用できなかった。このよ
うに、還元スラグは、資源として再利用する産業分野が
見出せなかったので、そのほとんどが産業廃棄物として
埋め立て処分されているのが現状である。When the above-mentioned powdered reduced slag is mixed with concrete, the concrete solidified body is cracked or partially peeled off, so that it is reused as civil engineering material. could not. As described above, since there was no industrial field in which recycled slag was reused as a resource, almost all of it was landfilled as industrial waste.
【０００６】この発明は、還元スラグの冷却過程での粉
状化をなくし、資源として再利用し得る還元スラグ固化
体を提供することを目的とする。[0006] It is an object of the present invention to provide a solidified reduced slag that can be reused as a resource by eliminating pulverization in the process of cooling the reduced slag.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明者等は鋭意研究の結果、ＣａＯ／ＳｉＯ２の
モル比を一定の値以下とすることによって、冷却過程で
の粉状化現象が無くなるという驚くべき事実を見出し、
本発明を完成した。Means for Solving the Problems In order to achieve the above object, the present inventors have made intensive studies and found that the molar ratio of CaO / SiO 2 is set to a certain value or less, so that pulverization during the cooling process is prevented. Finding the surprising fact that the phenomenon disappears,
The present invention has been completed.
【０００８】即ち本発明は、還元スラグにＳｉＯ２含有
体を添加して得られるスラグ固化体であって、該スラグ
固化体中の ＣａＯ／ＳｉＯ２ のモル比を２．１以下と
したことを特徴とする。That is, the present invention relates to a solidified slag obtained by adding an SiO 2 -containing substance to reduced slag, wherein the molar ratio of CaO / SiO 2 in the solidified slag is 2.1 or less. Features.
【０００９】[0009]
【発明の実施の形態】次に、本発明の実施の形態を説明
する。Next, an embodiment of the present invention will be described.
【００１０】製鋼工程で排出される還元スラグは、その
一例として次表２に示す化学組成を有している。酸化ス
ラグに比べてＣａＯ成分が著しく多く、例示した還元ス
ラグ組成中のＣａＯ／ＳｉＯ２のモル比は２．４であ
る。他のロットの還元スラグ中でのＣａＯ／ＳｉＯ２モ
ル比もほぼ２．２〜２．５の範囲にある。The reduced slag discharged in the steel making process has a chemical composition shown in the following Table 2 as an example. The CaO component is significantly larger than the oxidized slag, and the molar ratio of CaO / SiO 2 in the exemplified reduced slag composition is 2.4. The CaO / SiO 2 molar ratio in the reduced slag of other lots is also in the range of approximately 2.2 to 2.5.
【００１１】[0011]
【表２】還元スラグの化学組成例（％） 本発明に使用するＳｉＯ２含有体としては、ケイ石、石
炭灰、焼却灰、廃レンガ及び酸化スラグの１種若しくは
２種以上が挙げられる。ＳｉＯ２含有体として、純Ｓｉ
Ｏ２を使用することもできるが、コスト的理由から、上
記のような安価な原料を使用するのが好ましい。これら
ＳｉＯ２含有体は、溶融のし易さから、粒子状若しくは
粉末状とするのが良い。Table 2 Example of chemical composition of reduced slag (%) Examples of the SiO 2 -containing material used in the present invention include one or more of silica stone, coal ash, incinerated ash, waste brick, and oxidized slag. Pure Si as the SiO 2 containing body
O 2 can be used, but it is preferable to use the inexpensive raw materials as described above for cost reasons. These SiO 2 -containing substances are preferably in the form of particles or powder because of the ease of melting.
【００１２】本発明においては、ＣａＯ／ＳｉＯ２のモ
ル比は２．１以下でなければならず、これよりＣａＯ比
率が高いと、冷却過程で粉状化し、本発明の効果を発揮
しない。In the present invention, the molar ratio of CaO / SiO 2 must be not more than 2.1. If the CaO ratio is higher than this, the powder becomes powdery in the cooling process and the effect of the present invention is not exhibited.
【００１３】本発明の還元スラグ固化体は、溶融状態の
還元スラグに、ＣａＯ／ＳｉＯ２のモル比が２．１以下
となるように、ＳｉＯ２含有体を溶かし込んだ後、冷却
することによって得られる。具体的には，下記方法によ
って製造することができる。 （１）溶融状態の還元スラグに、ケイ石，石炭灰，焼却
灰、廃レンガ及び固化した酸化スラグの１種若しくは２
種以上のＳｉＯ２含有体を添加し、還元スラグの顕熱を
利用して、還元スラグ中にＳｉＯ２含有体を溶かし込ん
だ後、冷却する。 （２）ＬＦ炉における還元スラグ生成時に、ケイ石、石
炭灰、焼却灰、廃レンガ及び固化した酸化スラグの１種
若しくは２種以上のＳｉＯ２含有体を添加して、ＬＦ炉
に投入している電力を用いて、該ＳｉＯ２含有体を還元
スラグ中に溶かし込んだ後、冷却する。 （３）溶融状態の還元スラグと溶融状態の酸化スラグと
を、スラグポット内で混合し、冷却する。[0013] The solidified reduced slag of the present invention is obtained by dissolving an SiO 2 -containing material into a molten reduced slag such that the molar ratio of CaO / SiO 2 is 2.1 or less, and then cooling the molten slag. can get. Specifically, it can be manufactured by the following method. (1) One or two of silica stone, coal ash, incinerated ash, waste brick and solidified oxide slag are added to the molten reduced slag.
At least one kind of the SiO 2 -containing material is added, and the sensible heat of the reduced slag is used to dissolve the SiO 2 -containing material in the reduced slag, followed by cooling. (2) When reducing slag is generated in the LF furnace, one or two or more SiO 2 -containing substances of silica stone, coal ash, incineration ash, waste brick, and solidified oxide slag are added, and the mixture is introduced into the LF furnace. The SiO 2 -containing material is dissolved in the reduced slag by using electric power, and then cooled. (3) The reduced slag in the molten state and the oxidized slag in the molten state are mixed in a slag pot and cooled.
【００１４】次に、実施例を挙げて本発明を更に説明す
るが、本発明は、これら実施例に限定されない。Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.
【００１５】[0015]
【００１６】実施例１ 前記表２に示す還元スラグ粉末に、種々の割合でケイ石
（ＳｉＯ２）を混合し、その２０ｇをアルミナ坩堝に入
れ、１４５０℃で再溶融実験をし、冷却過程における粉
状化現象の有無を観察した。結果を次表３に示す。表
中、粉状化現象「無」は、石のように硬く全く粉状化し
ないが、粉状化現象「有」は、擦るとボロボロ粉状化し
て剥落するものであり、両者は明確に区別し得るもので
ある。Example 1 Silica (SiO 2 ) was mixed at various ratios with the reduced slag powder shown in Table 2 above, 20 g of the mixed slag was placed in an alumina crucible, re-melted at 1450 ° C., and cooled in the cooling process. The presence or absence of the powdering phenomenon was observed. The results are shown in Table 3 below. In the table, the powdering phenomenon "No" is hard like a stone and does not powder at all, but the powdering phenomenon "Yes" means that when rubbed, it breaks into powder and peels off. It can be distinguished.
【００１７】[0017]
【表３】還元スラグへのケイ石添加効果 上記結果から明らかなように、ＣａＯ／ＳｉＯ２のモル
比が２．１を越えると粉状化現象が起きるが、２．１以
下であると粉状化現象は全く生じない。[Table 3] Effect of silica stone addition to reduced slag As apparent from the above results, CaO / SiO 2 molar ratio is but occurs is powdery phenomenon exceeds 2.1, no at all powdered phenomenon When it is 2.1 or less.
【００１８】実施例２ ケイ石の替わりに石炭灰（ＣａＯ４．４％、ＳｉＯ２５
９．２％含有）を使用する以外は、実施例１と同様にし
て実施し、粉状化現象の有無を観察した。結果を次表４
に示す。[0018] The coal ash in place of Example 2 quartzite (CaO4.4%, SiO 2 5
(9.2% content), except that powdering was observed. Table 4 shows the results.
Shown in
【００１９】[0019]
【表４】還元スラグへの石炭灰添加効果 実施例１と同じように、ＣａＯ／ＳｉＯ２のモル比が
２．１を越えると粉状化現象が起きるが、２．１以下で
あると粉状化現象は全く生じない。[Table 4] Effect of coal ash addition to reduced slag As with Example 1, CaO / SiO 2 molar ratio is but occurs is powdery phenomenon exceeds 2.1, no at all powdered phenomenon When it is 2.1 or less.
【００２０】実施例３ 鋳鉄製スラグポット（内容積約６ｍ３）に入れた石炭灰
５００ｋｇに、溶融状態の還元スラグを、約２ｔづつ１
時間の間隔で３回注入した。その後、スラグ処理場にて
全量を流出させ、スラグを自然冷却させた。冷却過程を
観察したところ、未溶融状態の石炭灰は認められなかっ
た。このことから、予め入れておいた石炭灰は、還元ス
ラグの顕熱で溶かしこまれたものと判断される。また、
この冷却過程において、粉状化現象も見られなかった。
冷却後のスラグ固化体の化学分析値を次表５に示す。こ
の分析値からＣａＯ／ＳｉＯ２のモル比を算出したとこ
ろ、１．９であった。Example 3 Reduced slag in a molten state was added to 500 kg of coal ash placed in a cast iron slag pot (with an inner volume of about 6 m 3 ) by about 2 ton each.
Three injections were made at time intervals. Thereafter, the entire amount was discharged at a slag treatment plant, and the slag was naturally cooled. Observation of the cooling process revealed no unmelted coal ash. From this, it is judged that the coal ash put in advance was melted by the sensible heat of the reduced slag. Also,
In this cooling process, no powdering phenomenon was observed.
The chemical analysis values of the solidified slag after cooling are shown in Table 5 below. When the molar ratio of CaO / SiO 2 was calculated from this analysis value, it was 1.9.
【００２１】[0021]
【表５】石炭灰／還元スラグ固化体の化学組成（％） 実施例４ 石炭灰５００ｋｇに替えて焼却灰（ＣａＯ２８．５％、
ＳｉＯ２３９．１％含有）８００ｋｇを使用する以外
は、実施例３と同様にして実施し、還元スラグ固化体を
得た。この場合も、未溶融状態の焼却灰は認められず、
冷却過程での粉状化現象も見られなかった。冷却後の還
元スラグ固化体の化学分析値を次表６に示す。この分析
値からＣａＯ／ＳｉＯ２のモル比を算出したところ、
２．１であった。[Table 5] Chemical composition (%) of solidified coal ash / reduced slag Example 4 Incineration ash (CaO 28.5%,
Except that 800 kg of SiO 2 ( containing 39.1% of SiO 2 ) was used, the same procedure as in Example 3 was carried out to obtain a solidified reduced slag. Also in this case, no incinerated ash in the unmelted state was observed,
No powdering phenomenon was observed during the cooling process. Table 6 shows the chemical analysis values of the solidified reduced slag after cooling. When the molar ratio of CaO / SiO 2 was calculated from the analysis values,
2.1.
【００２２】[0022]
【表６】焼却灰／還元スラグ固化体の化学組成（％） 実施例５ 石炭灰５００ｋｇに替えて製鋼の第一工程であるＥＦ炉
から排出される溶融状態の酸化スラグ（ＣａＯ１２．８
％、ＳｉＯ２１０．８％含有）約４ｔを使用した以外
は、実施例３と同様にして実施し、スラグ固化体を得
た。この場合も、冷却過程での粉状化現象は見られなか
った。冷却後のスラグ固化体の化学分析値を次表７に示
す。この分析値からＣａＯ／ＳｉＯ２のモル比を算出し
たところ、２．１であった。Table 6 Chemical composition of incinerated ash / solidified reduced slag (%) Example 5 The oxidized slag (CaO12.8) in the molten state discharged from the EF furnace, which is the first step of steel making, instead of 500 kg of coal ash
%, Containing 10.8% of SiO 2 ) except that about 4 t was used to obtain a solidified slag. Also in this case, no powdering phenomenon was observed in the cooling process. The following Table 7 shows the chemical analysis values of the solidified slag after cooling. When the molar ratio of CaO / SiO 2 was calculated from this analysis value, it was 2.1.
【００２３】[0023]
【表７】酸化スラグ／還元スラグ固化体の化学組成
（％） 実施例６ ５ｍｍ以下に砕いた粒状の石炭灰２００ｋｇを、通電開
始５０分後の通常操業状態にあるＬＦ炉に投入し、更に
１０分間通電を継続した。この間、投入した石炭灰粒子
の状態を観察したところ、投入後５分程度で粒子が見ら
れなくなり、この時点で石炭灰粒子は還元スラグに溶解
したものと判断された。その後、通常操業通り、溶解し
た鋼とスラグを分離した。このスラグの重量を計量した
ところ２１５０ｋｇであった。このスラグをスラグ処理
場にて流出させ、自然冷却させた。この冷却過程におい
て、粉状化現象は見られなかった。冷却後のスラグ固化
体の化学分析値を、次表８に示す。この分析値からＣａ
Ｏ／ＳｉＯ２のモル比を算出したところ、１．８であっ
た。Table 7 Chemical composition (%) of solidified oxide / reduced slag Example 6 200 kg of granular coal ash crushed to 5 mm or less was put into an LF furnace in a normal operation state 50 minutes after the start of energization, and energization was continued for another 10 minutes. During this time, the state of the charged coal ash particles was observed. As a result, no particles were observed about 5 minutes after the charging, and it was determined that the coal ash particles were dissolved in the reduced slag at this time. Thereafter, the molten steel and slag were separated as in normal operation. The weight of the slag was weighed 2150 kg. This slag was discharged at a slag processing plant and allowed to cool naturally. In this cooling process, no powdering phenomenon was observed. Table 8 shows the chemical analysis values of the solidified slag after cooling. From this analysis, Ca
Was calculated molar ratio of O / SiO 2, it was 1.8.
【００２４】[0024]
【表８】石炭灰／還元スラグ固化体の化学組成（％） 実施例７ 石炭灰に替えてろう石質廃レンガ（ＣａＯ１．０％、Ｓ
ｉＯ２６７．５％含有）の５ｍｍ以下粉砕物を約１５０
ｋｇ使用した以外は、実施例６と同様にして実施し、ス
ラグ固化体２１００ｋｇを得た。この場合も、冷却過程
での粉状化現象は見られなかった。冷却後のスラグ固化
体の化学分析値を次表９に示す。この分析値からＣａＯ
／ＳｉＯ２のモル比を算出したところ、１．９であっ
た。Table 8 Chemical composition (%) of solidified coal ash / reduced slag Example 7 Instead of coal ash, waxy waste brick (CaO 1.0%, S
The 5mm or less pulverized iO 2 67.5% content) to about 150
The procedure was performed in the same manner as in Example 6 except that kg was used, to obtain 2100 kg of a solidified slag. Also in this case, no powdering phenomenon was observed in the cooling process. Table 9 below shows the chemical analysis values of the solidified slag after cooling. From this analysis, CaO
When the molar ratio of / SiO 2 was calculated, it was 1.9.
【００２５】[0025]
【表９】ろう石質廃レンガ／還元スラグ固化体の化学組
成（％） 本発明の還元スラグ固化体をコンクリートに混和して
も、その固化体に亀裂が生じたり、一部剥落が生じたり
しないことは、実験により十分確認されている。[Table 9] Chemical composition (%) of waste waxy brick / solidified reduced slag Experiments have confirmed that even when the reduced slag solidified product of the present invention is mixed with concrete, the solidified product does not crack or partially peel off.
【００２６】本発明の還元スラグ固化体は、砕石として
路盤材やコンクリート骨材として利用できるほか、庭
石、墓石、護岸工事用石材及び舗道用石材等として使用
することができる。The solidified reduced slag of the present invention can be used as a crushed stone as a roadbed material or a concrete aggregate, and can also be used as garden stones, tombstones, stones for revetment work, stones for pavement, and the like.
【００２７】本発明によりこれまで産業廃棄物として埋
立て処分するしかなかった還元スラグが、砕石等として
産業上利用し得るようになる。これにより山地の切り崩
しによる砕石の採取量を減少できるから、廃棄物の再資
源化による環境負荷低減だけでなく、自然環境破壊阻止
にも大いに貢献する。According to the present invention, reduced slag which had to be landfilled as industrial waste until now can be used industrially as crushed stones and the like. As a result, the amount of crushed stone collected by breaking down the mountainous area can be reduced, so that not only the reduction of the environmental load due to the recycling of waste but also the prevention of the destruction of the natural environment is greatly contributed.
【００２８】また、この還元スラグの砕石化処理のため
に用いる石炭灰や焼却灰及び廃レンガ等のケイ酸質廃棄
物のリサイクルにも繋がるので、廃棄物の再資源化によ
る循環経済の構築にも多大に寄与する。[0028] In addition, since it also leads to the recycling of siliceous waste such as coal ash, incinerated ash and waste bricks used for the crushing of the reduced slag, it is possible to construct a recycling economy by recycling the waste. Also greatly contributes.
【００２９】更に、石炭灰は、セメント原料として利用
されているが、セメント需要の低迷により石炭灰の利用
は長期的には減少する可能性がある。本発明は、石炭灰
の新たな処理法にもなるものであり、石炭灰の利用拡大
にも大いに寄与する。Further, coal ash is used as a raw material for cement, but utilization of coal ash may decrease in the long term due to sluggish demand for cement. The present invention is also a new method for treating coal ash, and greatly contributes to expanding the use of coal ash.
【００３０】本発明によれば、ＣａＯ／ＳｉＯ２のモル
比を２．１以下とすることにより、還元スラグは粉末化
現象が生じない固化体となるが、その理由は、理論的に
十分解明されていない。According to the present invention, by setting the molar ratio of CaO / SiO 2 to 2.1 or less, the reduced slag becomes a solid without powdering phenomenon. It has not been.
【００３１】[0031]
【発明の効果】以上述べた如く、本発明によれば、従来
埋立処分するしかなかった還元スラグを産業上利用し得
ることを可能としたものであり、廃棄物の再資源化によ
る環境負荷低減と自然環境破壊阻止に役立つことはもと
より、経済的な利点が大きく、その結果、製鋼コストが
低減するという絶大な効果を奏する。As described above, according to the present invention, reduced slag which had to be disposed of by landfill can be used industrially, and environmental load can be reduced by recycling waste. In addition to being useful for preventing the destruction of the natural environment, it has great economic advantages, and as a result, has a tremendous effect of reducing steel making costs.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4G012 JL03 JM04 4K014 CE01 4K063 AA03 AA12 BA02 CA02 CA03 HA01 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G012 JL03 JM04 4K014 CE01 4K063 AA03 AA12 BA02 CA02 CA03 HA01
Claims (6)
られるスラグ固化体であって、該スラグ固化体中の Ｃ
ａＯ／ＳｉＯ２ のモル比を２．１以下としたことを特
徴とする還元スラグ固化体。1. A solidified slag obtained by adding an SiO 2 -containing substance to reduced slag, wherein C in the solidified slag is obtained.
A solidified reduced slag, wherein the molar ratio of aO / SiO 2 is 2.1 or less.
焼却灰、廃レンガ及び酸化スラグの１種若しくは２種以
上である請求項１記載の還元スラグ固化体。2. The method according to claim 1, wherein the SiO 2 -containing material is silica stone, coal ash,
The reduced slag solidified body according to claim 1, which is one or more of incinerated ash, waste brick and oxide slag.
を溶かし込んだ後、冷却することを特徴とする請求項１
記載の還元スラグ固化体の製造方法。3. The method according to claim 1, wherein the SiO 2 -containing material is dissolved in the molten reduced slag and then cooled.
A method for producing a solidified reduced slag according to the above.
灰及び廃レンガの１種若しくは２種以上のＳｉＯ２含有
体を添加し、還元スラグの顕熱を利用して、該ＳｉＯ２
含有体を溶かし込む請求項３記載の製造方法。4. The reduced slag is added with one or more SiO 2 -containing substances of silica stone, coal ash, incinerated ash and waste bricks, and the sensible heat of the reduced slag is used to produce the SiO 2.
The production method according to claim 3, wherein the inclusion is dissolved.
ケイ石、石炭灰、焼却灰及び廃レンガの１種若しくは２
種以上のＳｉＯ２含有体を添加して、該ＳｉＯ２含有体
を溶かし込む請求項３記載の製造方法。5. A method for producing said reduced slag in an LF furnace,
One or two of silica stone, coal ash, incinerated ash and waste brick
4. The method according to claim 3, wherein at least one kind of SiO 2 -containing substance is added to dissolve the SiO 2 -containing substance.
ラグとを、スラグポット内で混合する請求項３記載の製
造方法。6. The production method according to claim 3, wherein the reduced slag in the molten state and the oxidized slag in the molten state are mixed in a slag pot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001037905A JP2002241150A (en) | 2001-02-15 | 2001-02-15 | Reduced slag solidified body and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001037905A JP2002241150A (en) | 2001-02-15 | 2001-02-15 | Reduced slag solidified body and its manufacturing method |
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|---|---|
| JP2002241150A true JP2002241150A (en) | 2002-08-28 |
Family
ID=18900974
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262537A (en) * | 2006-03-29 | 2007-10-11 | Sanyo Special Steel Co Ltd | Method for reforming electric furnace reducing slag |
| KR101193750B1 (en) | 2010-09-29 | 2012-10-22 | 현대제철 주식회사 | Manufacturing method for asphalt concrete aggregate using slag |
| JP2013071875A (en) * | 2011-09-28 | 2013-04-22 | Hoshino Sansho:Kk | Method for modifying electric arc furnace reducing slag |
-
2001
- 2001-02-15 JP JP2001037905A patent/JP2002241150A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262537A (en) * | 2006-03-29 | 2007-10-11 | Sanyo Special Steel Co Ltd | Method for reforming electric furnace reducing slag |
| KR101193750B1 (en) | 2010-09-29 | 2012-10-22 | 현대제철 주식회사 | Manufacturing method for asphalt concrete aggregate using slag |
| JP2013071875A (en) * | 2011-09-28 | 2013-04-22 | Hoshino Sansho:Kk | Method for modifying electric arc furnace reducing slag |
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